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- 2016
变预应力度装配式管柱抗震性能试验
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Abstract:
进行了5根高强混凝土装配式管柱在0.15轴压比下的拟静力试验, 研究配筋形式、预应力度对管柱抗震性能的影响．其中2个为配置12根预应力钢棒的试件, 3个为同时配置6根预应力钢棒和6根HRB400级钢筋的混合配筋试件, 5根管柱均通过装配式柱脚与承台连接．试验得到试件破坏形态、滞回曲线、承载能力、刚度变化、耗能能力等．结果表明：预应力度较小的混合配筋试件裂缝开展充分, 滞回环较仅配置预应力钢棒的试件饱满; 至试件破坏, 装配式柱脚均未发生较大变形或锚栓破坏, 满足正常使用要求．在此基础上, 修正混凝土结构设计规范中关于混凝土环形截面抗弯承载力计算公式, 建立了适用于高强混凝土混合配筋管柱正截面抗弯承载力计算公式．
Pseudo-static tests of five prefabricated high-strength concrete pipe column specimens under an axial compression ratio of 0.15 were conducted. The influencing factors including form of reinforcement and degree of prestress were analyzed. Two full prestressed reinforced specimensere configured with twelve prestress steel bars. Three hybrid reinforced specimens were configured with six prestress steel bars and six HRB400 reinforcements. Damage form of the specimens，the hysteretic curves，the bearing capacity，the stiffness degradation and the energy dissipation capacity were obtained from the tests. The results show that the hybrid reinforced specimens with lower degree of prestress have more cracks and fuller hysteretic curves than the full prestressed reinforced specimens. When the specimens were damaged，the prefabricated column foot had no large deformation and the anchor bolts were not damaged. On this basis，the study corrects the normal section flexural capacity calculation formula of ring-section members of concrete in the code for design of concrete structures and suggests the calculation formula applicable to high-strength concrete pipe column
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